/Engine/Source/Editor/AnimationBlueprintLibrary/Public/AnimationBlueprintLibrary.h
Since the subframe component ofFFrameTimeis clamped to the range [0.0, 1.0), it cannot accurately represent the use case where the timecode metadata represents subframe values as whole numbered subframes instead of as a percentage of a frame the way the engine does. The subframe component of theFQualifiedFrameTimereturned byEvaluateRootBoneTimecodeAttributesAtTime()may not reflect the authored subframe metadata in that case.
static bool EvaluateRootBoneTimecodeSubframeAttributeAtTime ( const [UAnimSequenceBase](API\Runtime\Engine\Animation\UAnimSequenceBase) * AnimationSequenceBase, const float EvalTime, float & OutSubframe )